Hydraulic pump structure



NOV. 28, G E DEAN ET AL HYDRAULIC PUMP STRUCTURE Filed Sept. 28, 1931 a a. olaxziolvlolalaio.

Gem' e-.. @um

Chamb G. WMC-,TT

T20 dumping mechanism to speed up its Operation ance to motion and hence thev pressure of the 75 25 to be made with any degree 0f Speed because the aS at 21 and iS pIOVlded. With all Operating handle 80 Patented Nov. 28, v1933 l I i 4 r- UNHTED STATES '1,937,471 i' `HYDRAULIO` PUlWR rSTRUCTURE Y George E. Dean, Walker Township, Kent County, if 'i land Charles Gn Willett, Grand Rapids, Mich.; said Dean assigner to saidvtillett` 4' Application'Septemberl .Y j l l Serial No. 565,474

1 claim. (o1. 10s-s) This invention relates generally to a hydraulic` obvious to one skilledin the art 'from the followpump structure and more particularly to a lever ing description. l v arrangement with an adjustable fulcrum'for op In the drawingzerating the same whereby the amount of travel Fig. l is a sideelevation of our improved lever 5 of the operating lever may be controlled. mechanism as applied to a pump. '60

The structure herein described is primarily Fig. 2 is a side view of the mechanism shown adapted to be used with the hydraulic operating in Fig. 1. mechanism for a dump body on atruck but it is Fig. 3 is an enlarged View of the connectiony to be understood that the mechanism may be between the' fulcrum links'and the main lever.` l() used Wherever needed With the Shifting lOd COIlneCted there/t0. *A i 65 t During the elevation of a loaded dump truck Like yntllneials refer t like parts throughoutv body the resistance thereof gradually decreases the several views. t v as the body is tilted and consequently the amount Referringr t0 ytlle drawing, 10 ndiCates a pump of leverage can be and should be decreased in Cylinder, having a stufling bOX 117 in Which the l5 order to facilitate or speed up the dumping oper- Dump plunger 12 is Sldably mounted. An'outlet 79 ation. In other words, less power is needed to pipe 13 transmits the pressure lllid flOm the oscillate the manual operating lever when the Cylinder t0 the hydraulic mechanism (nOt slIOWn) load is partly elevated and consequently the ful- Whereby the lOad may be acted unOfn: The lOa'd, crum or the lever can be changed to cause the as Previously desribed, is Variable in its resist- In the above manipulation it will be noted that bydrauli lud Sl'lOuld be Varied and We accomthe resistance of the load to dumping position Dlish this by Changing the fulCruIn pOnt 0f the progressively decreases and hence the shift of main leVer as Will nOW be describedthe fulcrum to give less advantage does not need The main lever 20 is DiVOted t0 the plunger 12 operator can easily shift the fulcrum changing 22, this handle being grasped by the Operatbr 0f mechanism back to the higher degree of power the device whooscillates it to and fro thereby application should the movement of the load be reciprocating the Dumb plunger 12 and this stopped with the result that a considerable Causes the pressure fluid t0 be transmitted 30 amount ef power would be needed t0 again put it through the outlet pipe 13. 1 The lever 20 is oiset 85 in motion. and provided with an opening as indicated at 23 It will be appreciated, however, that our invenand a Sleeve 241s rigidly mounted therein as is tion might be readily used in a situation where it Clearly ShOWn in Fig. 3. l 4 was necessary to change from a low leverage to a The sleeVe 24 is ClOSed at its upper end and a '35 high leverage and in such case it is necessary that rOd 25 slidably extends therethrough, the upper 90 the change be rapidly made in order that the end of this rod being pivoted at 26 onto the short Weight of the body or load which is being moved auxiliary lever 27 which, in turn, is pivoted onto Y be kept in motion in order that the inertia of the the main leVer 20 aS indicated at28. l same does not have to be overcome in a starting The lOWer end 0f the rod 25 is threaded into a operation. That is, the leverage system is member 30, this member 30 snugly engaging the 95 changed to a higher degree of leverage and the Sleeve 24, see Fig. 3, and the lOWer end has an eye l same cannot be shifted in any manner to increase DDrtOn 31 fitting around the pvot bolt 32. this advantage, as could be done in the previous The pir/Ot bOlt 32 passes thrOugh the fulcrum case, and, consequently, it is necessary that the linkS 33, these links being Dil/'Oted at their ODDO- shifting be rapidly done and we provide spring site ends to the bracket 35 as indicated at 34. 100 Y means for accomplishing this result. See Fig. l. f

Briefly described, our invention consists of a y A coiled spring', 36, see Fig. 3, surrounds the lever of the first class having an adjustable ful-v lower end of the rod 25 andV pushes against the crum therefor, this fulcrum being controlled by upper end 0f the member 30 thus Causing the an auxiliary lever mounted upon the main lever pivot boltl 32 to be shifted downwardly to the 106 whereby the advantage of the leverage arrangedotted line position as shown in Fig. 1, Whenever ment may be changed. Spring means are prothe auxiliary lever 217` is moved from its upright.A vided for facilitatingl the leverage change from a dead center position, such being shown in full Y long leverage to a short leverage. lines in Figs. 1 and 2. Hence, whenever the lever 55 The further objects` and advantages .will be 27 isA shifted clockwise, see Fig. l, thesprng 36110 within the purview of our invention to adjusttheY auxiliary handle 27 to a series of-fp'o'sition's whereby the pivot pin fulcrum 32 will be correspondingly varied.

We claim: 'Y In an operating device for a variable l'ad, the combination of an oscillatable level` adapted 'to he the prime mover, said lever` having a handle at one end, a slot near the other end and offset laterally therebetween, a fulcrum link pivoted to a xed pivot and extending adjacent said slot in said lever, pivotal means extending throughthe said slot and the adjacentlink, a sleeve extending alongside of the lever and throughsaidoiset portion whereby it is rigid therewith,"slid'ab1'e means v-niounted in said sleeve, means connecting one end ofthe slidable means to the pivotalmeans whereby the same may be movedalong the said sint, fmeansfatthe other end of the said slidable means whereby it may be reciprocated for the A'pljgiflposed es'irerl and loperating means connected "between the leverfand the'load.V

GEORGE E. DEAN. '(.lI-IAHLES` G. WILLETT. 

